BIOL 261 CHAPTERS 1-5: EXAM 1
POWELL ULL QUESTIONS ALL
SOLVED.
Deduce why viruses are excluded from the ribosomal RNA--- based tree of life - Answer they
lack ribosomal RNA (rRNA)
In what/which domain(s) of life is/are microorganisms represented? - Answer Archaea,
Bacteria, Eukarya
The person who described the "wee animicules" was - Answer Antoni van Leeuwenhoek
Transparent double-sided dishes used for growing microbes are most commonly called
__________ - Answer petri dishes
a pure culture ____________________ - Answer is a population of identical cells
In what ways are microorganisms important to humans? - Answer animal health, human
health, ecosystem health, water, & waste, agriculture, natural resources, food, biotechnology,
industry, & bioenergy
What is a bacterial colony and how is one formed? - Answer a visible population of cells
growing on solid media, arising from a single cell; as the bacteria consume the nutrients, they
begin to grow and multiply. This generates thousands to millions to billions of cells that begin to
pile up, becoming visible to the naked eye (this pile generates from one cell)
How can you get a pure culture of bacteria and why are pure cultures important? - Answer A
culture is cells grow in or on a nutrient medium; also referred to as an isolated culture or a
"stock" culture; we are only able to identify bacteria in a pure culture since they are alone.
Bacteria does not grow in a pure culture, so if we tried to identify them in their original state
(mixed up), we would not be able to accurately identify it
Where do you find microorganisms and do they typically live in a pure culture? - Answer
microorganisms are found everywhere and live in microbial communities and they do not
typically live in a pure culture
What cellular structures distinguish prokaryotic and eukaryotic cells? - Answer Prokaryotic
has no nucleus, singular circular chromosome (nucleoid), plasmids (extra chromosomal DNA
and small and contact and eukaryotic has a nucleus, linear chromosomes within nucleus, much
larger with more DNA, and has membrane bound organelles
POWELL ULL QUESTIONS ALL
SOLVED.
Deduce why viruses are excluded from the ribosomal RNA--- based tree of life - Answer they
lack ribosomal RNA (rRNA)
In what/which domain(s) of life is/are microorganisms represented? - Answer Archaea,
Bacteria, Eukarya
The person who described the "wee animicules" was - Answer Antoni van Leeuwenhoek
Transparent double-sided dishes used for growing microbes are most commonly called
__________ - Answer petri dishes
a pure culture ____________________ - Answer is a population of identical cells
In what ways are microorganisms important to humans? - Answer animal health, human
health, ecosystem health, water, & waste, agriculture, natural resources, food, biotechnology,
industry, & bioenergy
What is a bacterial colony and how is one formed? - Answer a visible population of cells
growing on solid media, arising from a single cell; as the bacteria consume the nutrients, they
begin to grow and multiply. This generates thousands to millions to billions of cells that begin to
pile up, becoming visible to the naked eye (this pile generates from one cell)
How can you get a pure culture of bacteria and why are pure cultures important? - Answer A
culture is cells grow in or on a nutrient medium; also referred to as an isolated culture or a
"stock" culture; we are only able to identify bacteria in a pure culture since they are alone.
Bacteria does not grow in a pure culture, so if we tried to identify them in their original state
(mixed up), we would not be able to accurately identify it
Where do you find microorganisms and do they typically live in a pure culture? - Answer
microorganisms are found everywhere and live in microbial communities and they do not
typically live in a pure culture
What cellular structures distinguish prokaryotic and eukaryotic cells? - Answer Prokaryotic
has no nucleus, singular circular chromosome (nucleoid), plasmids (extra chromosomal DNA
and small and contact and eukaryotic has a nucleus, linear chromosomes within nucleus, much
larger with more DNA, and has membrane bound organelles
